Question

What happens if multiple processes block on the same descriptor using select()? Which are woken up?

A. All processes are woken up.
B. Only one process is woken up.
C. Processes are woken up based on priority.
D. Processes are woken up randomly..

Answer 1

When multiple processes block on the same descriptor using select(), only one process is woken up.

Step-by-step explanation:

If multiple processes are blocking on the same descriptor using select(), only one process is woken up. The process that is woken up is typically determined by the operating system's scheduler. It is important to note that select() is a synchronous call and only returns when at least one descriptor is ready for I/O operations. Once one process is woken up, it can then perform the necessary I/O operations on the descriptor.